The F-C-F bond angle in the CH2F2 molecule is approximately . Group of answer choices

180°

90°

120°

60°

109.5°

Word equation for k+ h2o yield koh + h2

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.